Re: best way to choose index to cluster on?
| От | adey |
|---|---|
| Тема | Re: best way to choose index to cluster on? |
| Дата | |
| Msg-id | 1c66bda80609251527i4e8bad89jb6c1420cd44a8a33@mail.gmail.com обсуждение исходный текст |
| Ответ на | best way to choose index to cluster on? ("Chris Hoover" <revoohc@gmail.com>) |
| Ответы |
Re: best way to choose index to cluster on?
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| Список | pgsql-admin |
A good guide for a clustered index is:-
Will the index be unique, static and narrow.
If not, avoid clustered indexing as they require extra work on disk to maintain their sequence.
On 9/26/06, Chris Hoover <revoohc@gmail.com> wrote:
I am looking to squeeze a bit more speed out of my database by clustering most of my tables. However, on tables with multiple indexes, how is the best way to choose the index. I am thinking I want to use the index with the largest pg_stat_user_indexes.idx_tup_read. Would this be correct? If not, what column(s) and views should I be looking at to find the most popular index?
Secondly, I have some partial indexes on a very active table, and it tends to have the highest idx_tup_read for that table. Is is possible to cluster on a partial index?
Thanks,
Chris
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